Once upon a time, there used to be a big library of custom tags and things created by the community and made available to browse and download. Generally speaking, everything I am looking to build, has already been built, in whole or in part, by someone before me. It was helpful. Does anything like that exist anywhere today? Please let me know.
I believe CFLIB.ORG is still in existence, but no longer updated. AFAIK, it has not been replaced by anything.
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UPDATE: Yes, https://cflib.org is still running. Looks like nothings been added since 2017, though.
While CFLib is still running, there aren't any ColdFusion Custom Tags listed there. It's a pretty decent repository of User Defined Functions (UDF). RIAForge is dead, but some of the libraries are still available online (and have been archived by developers.)
Forgebox.io is a good source for modern CFML. They list many CFCs and modules you can add to your project, but no custom tags. (I've been converting custom tags to CFCs as I am able too... better performance, re-usuability and whitespace management.)
There's nowhere online that caters to hosting and promoting ColdFusion projects like RIAForge did. Prior to that, there were a couple of different websites that allowed you to sell your code. (I'd like to think that there's a market for that as I have developed a superior drop-in CFMap custom tag replacement that supports multiple map services.)